Work out brewster angle instantly with clear inputs, formula shown and shareable results.
At Brewster's angle, arctan(n2/n1), the reflected and refracted rays are exactly 90 degrees apart and the reflection contains no light polarised in the plane of incidence. Air to glass at 1.52 gives 56.7 degrees. This is why polarising sunglasses cut glare from water and roads so effectively.
Brewster's angle
theta(B) = arctan(n2 / n1)
Geometry
reflected and refracted rays are perpendicular
About 53.1 degrees for n = 1.333, which is roughly the elevation at which surface glare is strongest and most polarised.
The dipoles set oscillating in the second medium cannot radiate along their own axis, and at Brewster's angle that axis points exactly where the reflected ray would go.